The best way to get daily data for specified equities is to use
data.history. Here's the documentation on it. If you want the previous day's OHLC, you would do something like this:
data.history(sid(24), 'high', 2, '1d')[-2]
We index in and take the second-to-last element because the last is the data so far for the current day. So if you want today's open, you would do:
data.history(sid(24), 'open', 1, '1d')[-1]
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